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prometheusinterceptor.go
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/
prometheusinterceptor.go
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package serverinterceptors
import (
"context"
"strconv"
"time"
"github.com/zeromicro/go-zero/core/metric"
"github.com/zeromicro/go-zero/core/prometheus"
"github.com/zeromicro/go-zero/core/timex"
"google.golang.org/grpc"
"google.golang.org/grpc/status"
)
const serverNamespace = "rpc_server"
var (
metricServerReqDur = metric.NewHistogramVec(&metric.HistogramVecOpts{
Namespace: serverNamespace,
Subsystem: "requests",
Name: "duration_ms",
Help: "rpc server requests duration(ms).",
Labels: []string{"method"},
Buckets: []float64{5, 10, 25, 50, 100, 250, 500, 1000},
})
metricServerReqCodeTotal = metric.NewCounterVec(&metric.CounterVecOpts{
Namespace: serverNamespace,
Subsystem: "requests",
Name: "code_total",
Help: "rpc server requests code count.",
Labels: []string{"method", "code"},
})
)
// UnaryPrometheusInterceptor reports the statistics to the prometheus server.
func UnaryPrometheusInterceptor(ctx context.Context, req interface{},
info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
if !prometheus.Enabled() {
return handler(ctx, req)
}
startTime := timex.Now()
resp, err := handler(ctx, req)
metricServerReqDur.Observe(int64(timex.Since(startTime)/time.Millisecond), info.FullMethod)
metricServerReqCodeTotal.Inc(info.FullMethod, strconv.Itoa(int(status.Code(err))))
return resp, err
}